#include #include #include #include #include #include #include "calc.h" #include "usart.h" void usart_init(uint16_t ubrr) { /*Set baud rate */ UBRR0H = (uint8_t)(ubrr >> 8); UBRR0L = (uint8_t) ubrr; // Enable Rx and Tx UCSR0B = (1 << RXEN0) | (1 << TXEN0); // 8-bit data, 1 stop bit UCSR0C = (0b11 << UCSZ00); } /** Send byte over USART */ void usart_tx(uint8_t data) { // Wait for transmit buffer while (!usart_tx_ready()); // send it UDR0 = data; } /** Receive one byte over USART */ uint8_t usart_rx(void) { // Wait for data to be received while (!usart_rx_ready()); // Get and return received data from buffer return UDR0; } /** Send string over USART */ void usart_puts(const char* str) { while (*str) { usart_tx(*str++); } } /** Send progmem string over USART */ void usart_puts_P(const char* str) { char c; while ((c = pgm_read_byte(str++))) { usart_tx(c); } } /** Clear receive buffer */ void usart_flush_rx(void) { uint8_t dummy; while (bit_is_high(UCSR0A, RXC0)) { dummy = UDR0; } }